.root {
    position: relative;
    z-index: 3;
    height: 40px;

}

.mask {
    position: fixed;
    z-index: 2;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: rgba(0,0,0,.5);
}

.content{
    position: absolute;
    width: 100%;
    z-index: 3;
    background-color: #fff;
}
